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首页> 外文期刊>Journal of Applied Polymer Science >Environment-friendly chemical recycling of aliphatic polyurethanes by hydrolysis in a CO2-water system
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Environment-friendly chemical recycling of aliphatic polyurethanes by hydrolysis in a CO2-water system

机译：二氧化碳水解中水解的环境友好型化学回收脂族聚氨酯

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In order to develop a chemical recycling system of polyurethanes (PUs), environment-friendly hydrolysis of two types of aliphatic PUs was studied under pressured CO2 in water, in which the carbonic acid generated from CO2 acted as an acid catalyst. Two PUs, namely H-PU or I-PU, were synthesized starting from 1,4-butanediol and 1,6-hexamethylene diisocyanate or isophorone diisocyanate, respectively. The hydrolysis of PUs depended on the experimental conditions, such as the temperature and CO2 pressure. As a result, 98% of H-PU and 91% of I-PU were successfully hydrolyzed under the typical conditions of 190 degrees C for 24 h at 8.0 MPa CO2. The reaction mixtures afforded 1,4-butanediol and diamines without the formation of any byproducts. Both of these raw materials generated from the originated PUs by selective hydrolytic cleavage of the urethane linkages, and they were easily isolated in high yields simply by evaporation of the water-soluble components within the reaction mixture. By comparing the results of the two aliphatic PUs with those of an aromatic PU (M-PU), the hydrolyzability was found to decrease in the order H-PU, I-PU, and M-PU. The difference can be ascribed to the hydrophilicity of the aliphatic or aromatic groups connected to the urethane moieties at the terminals of PUs. (C) 2017 Wiley Periodicals, Inc.
机译：为了开发聚氨酯（PU）的化学回收系统，在水中的CO 2中研究了两种类型的脂族脓液的环保水解，其中来自CO2产生的碳酸作为酸催化剂。从1,4-丁二醇和1,6-六亚甲基二异氰酸酯或异佛酮二异氰酸酯，合成两个脓液，即H-PU或I-PU。 PU的水解依赖于实验条件，例如温度和CO 2压力。结果，98％的H-PU和91％的I-PU在190℃的典型条件下成功地水解，在8.0MPa CO 2下24小时。反应混合物得到1,4-丁二醇和二胺而不形成任何副产物。这些原料中的两种原料通过选择性水解裂解氨基甲酸酯键的选择性裂解，并且通过蒸发反应混合物内的水溶性组分蒸发，它们容易地分离出来。通过将两个脂族脓液与芳族PU（M-PU）的结果进行比较，发现水解性H-PU，I-PU和M-PU的顺序降低。差异可以归因于在PU的末端连接到氨基甲酸酯部分的脂族或芳族基团的亲水性。 （c）2017 Wiley期刊，Inc。

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